Slip form paving marker



C. H. GIBBS SLIP FORM PAVING MARKER Filed Dec. 26, 1953 2 Sheets-Sheet l I/VVf/VTOR. Cam/.55 5/3255. /%Q ITTOR/YIX Sept. 3,1935. H. 6.555 2,013,407

SLIP FORM PAVING MARKER Filed Dec. 26, 1953 2 Sheets-Shet 2 Patented Sept. 3, 1935 STATES PATENT OFFIQE SLIP FORM PAVING MARKER Application December 26, 1933, Serial No. 703,951

8 Claims.

This invention relates to a slip form paving marker whereby a permanent stripe of cement, concrete, or the like is provided in a street or highway.

An object of my invention is to provide a marker which operates immediately back of the mixer, tamper, or the like, on the highway and forms a stripe in the road while the concrete or cement is in a wet or unset condition.

Another object is to provide a marker of the character stated which will form a true straight or curved line at a given position in the road.

A further object is to provide a novel means of protecting the stripe while the balance of the adjacent road is being worked upon.

Still another object is to provide a novel paving marker which will accurately follow the contours of the road.

Other objects, advantages and features of the invention may appear from the accompanying drawings, the subjoined detailed description, and

the appended claims.

In the drawings Figure l is a plan View of my marker attached to a tamper, mixer, or the like.

Figure 2 is a perspective view of one of the smoothing plates.

Figure 3 is a transverse sectional View of the hopper.

Figure 4 is a perspective view of my marker.

Figure 5 is a perspective view of a modified form of marker.

Figure 6 is a longitudinal vertical section of same.

Figure 7 is a fragmentary perspective view of a road in which my marking strip is placed.

Figure 8 is a fragmentary perspective view of my marker, showing the coupling between the front and rear hopper.

My marker is attached to the tamper or mixer and therefore operates in the cement or concrete while it is still wet, and before the cement or concrete has had time to set, or partially set. Therefore, the road is not disturbed, the cement or concrete is not weakened, and a complete and effective bond is accomplished between the material forming the stripe and the material of the road.

The numeral I indicates one of the usual appliances used in road building, such as the mixer,

the tamper, or the like. The paving marker 2 is attached to the appliance l by means of a drag link which pulls the marker forwardly, and insures the proper alignment of the marker and also enables said marker to move over the various contours of the road.

The paving marker comprises a plurality of hingedly mounted blocks 3. These blocks are preferably dovetailed each into the other, and are pivotally mounted together by means of pins 4 which extend thru the blocks, thus enabling the marker to move over irregularities in the road, or over breaker strips or expansion joints 5. The front block is attached to a plow 6 which cuts a groove or furrow in the road to the required depth.

A transverse inclined smoothing plate 1 is mounted rearwardly of the plow 6 to smooth the surface of the road after the plow has passed, and also carries the larger pieces of aggregate to one side so that a smooth and unbroken upper surface is formed.

A plate 8 is formed or attached to the front block 3 and a drag link 9 is secured to this plate and to the implement I. The drag link is preferably hooked into the plate 8 and into the implement so that a free vertical movement is permitted between the marker and the implement. The drag link 9 may be attached to any convenient part of the implement l, and as here shown, it is secured to one side thereof. This is necessary when only one-half of the road is being poured and the stripe is being formed at the center of said road. If the entire road is being poured at one time, the paving marker would be attached to the center of the implement, or at the side if an edge marker is desired.

A hopper section I0 is pivotally secured to the rearmost block 3 and the hopper H is mounted on the top thereof. The section Ill has a hole I2 extending therethru so that the cement or concrete to form the stripe will fall into the groove formed by the plow 6. The rear part of the hopper section it is preferably channel-like, as shown at l3, so that the solid block of cement or concrete is poured into the groove formed by the marker, the top of this block being substantially level with the upper surface of the road.

Back of the hopper section, I may provide a plurality of smoothing plates M. A pin I5 is provided on the hopper section and the front smoothing plate has a hole l6 formed therein thru which the pin l5 extends. Adjacent smoothing plates are attached together in the same manner. Each of the plates is substantially wedge-shaped, and is provided with depending side walls IT. The smoothing plates drag over the stripe to smooth out the upper surface, and also gauge the width of the stripe. The stripe is now finished, but the balance of the road must be worked upon, i. e., it is trowled or smoothed, and to protect the stripe, I provide a plurality of pans l8. These pans fit over the stripe and cover the top thereof so that the balance of the road can be worked upon without in any way injuring the smooth stripe formed by my marker.

Due to the caterpillar-like mounting or assembly of the blocks 3 and the section It], it will be evident that my marker can move over irregularities in the road or over expansion joints, reinforcements, or the like, without in any way injuring or hindering the progress of the work. The cement or concrete to form the stripe is shoveled into the hopper I I by a workman.

Due to the fact that a groove is formed in the wet concrete of the road and a cement or concrete to form the stripe is immediately placed in this groove, an effective bond will be provided 5 to 8, inclusive, the stripe is placed in a road having a surface layer of asphalt or bituminous material. A groove is left in the asphalt and my marker is then drawn 'over the road and places concrete in this groove to provide a permanent stripe.

As shown in Fig. 7, the concrete bed 20 is covered with a layer of asphalt or bituminous material 2 l The groove 22 is left in the asphalt at the desired point and the asphalt covering is rolled or packed down to make a dense and hard surface. Reinforcing rods, or the like, 23 are placed in the groove 22 for a purpose, which will be sub-' sequently described.

For this class of work, my paving marker comprises a front section 24 and a rear section 25. The front section consists of a hopper 26 which is mounted upon a channel-like base 21. The rear section 25 comprises a hopper 28 and a channel base 29. The bases 2'! and 29 extend rearwardly from the hoppers 26 and 28, respectively, to act as smoothing pans for the cement deposited from the hoppers.

An angle bar 30 is attached to the hopper 26 across the front edge thereof, and the ends of this bar protrude beyond the hopper. The reason for this bar is to provide a support at the front end of the hopper upon the asphalt on either side of the groove, so that my marker will not rest upon the bottom of the groove but will be supported within the groove in order that the quantity of cement can be deposited.

The rear hopper 28 has an angle bar 3! attached to the front edge thereof, this latter bar acting in the same manner as the bar 30.

.A third bar 32 extends across the back of the channel 29 so as to hold up the rear end of the marker.

The channel 21 is provided with a plurality of pins 33 which extend thru holes in the bar 3|, thereby coupling the front and rear sections. This arrangement also permits limited movement between the two sections, which is desirable, be-

cause the two sections are not operating in the same horizontal planes. That is, the fronthopper 26 deposits a grey cement in the bottom of the groove 22 to a point approximately level with the tops of the reinforcing bars 23. The rear hopper 28 then deposits a white cement on top of the grey cement, the top surface of the white cement coinciding with the top surface of the asphalt layer 2|. The layer of white cement is much thinner than the layer of grey cement underneath it. The two layers of cement are poured practically simultaneously, and will therefore be Well bonded and will set as one homogeneous mass.

. A spring plate 34 is positioned in the channel 29 and at the rear thereof, the purpose of this plate being to adjust the height of the channel 29 above the top of the grey surface previously deposited by the hopper 26. Thus, the thickness of the white layer of cement can be regulated.

Bolts 35 extend from the plate 34 thru the channel 29 whereby the curvature of the spring plate can be adjusted. The side edges of the channels 21 and 29 bear against the sides of the groove 22. A clear and accurate stripe is thus placed in the groove. The hoppers are drawn from a suitable conveyance by means of a bar or link attached to the ring 36 on the front of the hopper 26.

Having described my invention, I claim:

1. A slip form paving marker comprising a plurality of blocks, a horizontal pivot securing adjacent blocks together, attaching means secured to one of said blocks whereby the marker is attached to a paving implement, a hollow hopper section attached to the rearmost of said blocks and a hopper mounted on said hopper section. V

2. A slip form paving marker comprising a plurality of blocks, means pivotally securing said blocks together, attaching means secured to one of said blocks whereby the marker is attached to a paving implement, a hollow hopper section attached to the rearmost of said blocks, a hopper mounted on said hopper section, a'plow secured to the foremost of said blocks and a smoothing plate mounted on said hopper section.

3. A slip form paving marker comprising a plurality of blocks, a pin extending thru adjacent blocks whereby said blocks are pivotally secured.

together, a drag link secured to the foremost block whereby the marker is pulled thru the wet concrete, a plow on the foremost block, a hopper section, means securing the hopper section to the rearmost block and a hopper on said hopper section.

4. A slip form paving marker comprising a plurality of blocks, a pin extending thru adjacent blocks whereby said blocks are pivotally secured together, a drag link secured to the foremost block whereby the marker is pulled thru the wet concrete, a plow on the foremost block, a hopper section, means securing the hopper section to the rearmost block, a hopper on said hopper section, and a smoothing plate attached to the rear end of said hopper section. V

5. The method of forming a strip in a concrete roadway comprising, first, forming a groove in the unset concrete, then pouring cement into the groove, then covering the groove with the cement within, whereby it is protected while the balance of the road is worked upon.

6. A slip form paving marker comprising a plurality of blocks, means p-ivotally securing said blocks together, attaching means secured to one of said blocks whereby the marker is attached to a paving implement, a hollow hopper section attached to the rearmost of said blocks, a hopper mounted on said hopper section, and a plurality of cover pans positioned rearwardly of said hopper section, said pans covering the groove formed by said blocks and the cement which is poured into said groove from the hopper.

7. A paving marker comprising a pair of hoppers, arranged in tandem, a channel base for each of the hoppers, means securing the hoppers together, transverse bars on the marker, said bars supporting the hoppers by contact with the road, and a plate adjustably mounted at the rear of the back channel base.

8. A slip form paving marker comprising groove-forming means adapted to be moved thru unset concrete whereby a groove is formed, a hopper on said groove-forming means, said hopper being adapted and arranged to pour cement into the groove formed by the groove-forming means, and a plurality of cover pans positioned rearwardly of said groove-forming means, said pans covering the grooves formed by the groove-forming means and the cement which is poured into 10 said groove from the hopper.

CHARLES H. GIBBS. 

